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Consolidated Bioprocessing for Butyric Acid Production from Rice Straw with Undefined Mixed Culture

文献类型： 外文期刊

作者： Ai, Binling 1 ; Chi, Xue 2 ; Meng, Jia 2 ; Sheng, Zhanwu 1 ; Zheng, Lili 1 ; Zheng, Xiaoyan 1 ; Li, Jianzheng 2 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Haikou Expt Stn, Haikou, Peoples R China

2.Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin, Peoples R China

关键词： butyric acid production;rice straw;consolidated bioprocessing;undefined mixed culture;carboxylate platform

期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：5.64； 五年影响因子：6.32 ）

ISSN： 1664-302X

年卷期： 2016 年 7 卷

页码：

收录情况： SCI

摘要： Lignocellulosic biomass is a renewable source with great potential for biofuels and bioproducts. However, the cost of cellulolytic enzymes limits the utilization of the low-cost bioresource. This study aimed to develop a consolidated bioprocessing without the need of supplementary cellulase for butyric acid production from lignocellulosic biomass. A stirred-tank reactor with a working volume of 21 L was constructed and operated in batch and semi-continuous fermentation modes with a cellulolytic butyrate-producing microbial community. The semi-continuous fermentation with intermittent discharging of the culture broth and replenishment with fresh medium achieved the highest butyric acid productivity of 2.69 g/(L.d). In semi-continuous operation mode, the butyric acid and total carboxylic acid concentrations of 16.2 and 28.9 g/L, respectively, were achieved. Over the 21-day fermentation period, their cumulative yields reached 1189 and 2048 g, respectively, corresponding to 41 and 74% of the maximum theoretical yields based on the amount of NaOH pretreated rice straw fed in. This study demonstrated that an undefined mixed culture-based consolidated bioprocessing for butyric acid production can completely eliminate the cost of supplementary cellulolytic enzymes.

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[1]Effect of pH and Buffer on Butyric Acid Production and Microbial Community Characteristics in Bioconversion of Rice Straw with Undefined Mixed Culture. Ai, Binling,Li, Jianzheng,Chi, Xue,Meng, Jia,Jha, Ajay Kumar,Liu, Chong,Shi, En,Ai, Binling.

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